package Thread;

class MyBlockingQueue {
    private String[] data = null;
    private volatile int head = 0;
    private volatile int tail = 0;
    private volatile int size = 0;

    private Object locker = new Object();

    public MyBlockingQueue(int capacity) { data = new String[capacity];}

    public void put(String s) throws InterruptedException {
        //加锁的对象,可以单独定义一个,也可以直接就地使用this.
        synchronized (this) {
            while (size == data.length) {
                //队列满了
                //return
                this.wait();
            }
            data[tail] = s;
            tail++;
            if(tail >= data.length) {
                tail = 0;
            }
            size++;

            this.notify();
        }
    }

    public String take() throws InterruptedException {
        String ret = "";
        synchronized (this) {
            while (size == 0) {
                //队列为空
                //return null
                this.wait();
            }
            ret = data[head];
            head++;
            if (head >= data.length) {
                head = 0;
            }
            size--;

            this.notify();
        }
        return ret;
    }
}

public class Demo14 {
    public static void main(String[] args) {

    }
}
